How can I apply enscript to upwards of 60k files?

I want to apply Gnu enscript on a large collection of files (every file tracked by git in the current Linux kernel). I have just for the hell of it. However, I've tried various things to pass those files as arguments such as a python script and $(foo), but it says that I am giving it too many arguments. For example, if I put the names of all the files into files.txt, one per line, then invoke enscript --color --toc -o out.ps $(, it prints the error. The same argument list runs just fine with echo. To solve this issue, I have tried to add to enscript the ability to read the files to process from a file, but I can't get the enscript source to compile before even making any modifications. Is there something that I'm missing or is this impossible?